Note: You should already have an active domain with Register.com.
Step1. Log into your Register.com account and hover your mouse over the Domains icon and click the MANAGE link.
Step2. Click the Manage link after that.
Step3. Click the Edit IP Address Records link from below then add the IP address. Once finished click the Continue button.
Step4. Click the Continue button once again to confirm the changes.
You should now have A record pointing to the following IP address 18.104.22.168